Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fd92590df9c464…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 05:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005cf76d055cb071964dbbf379fd458e SHA-1: e991f81ba6e3e59c4d0fddf791a50dbebe631472 SHA-256: 16fd92590df9c464be6d8429bd908ef9418646f4247216dc44236dd91d99cd98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, creating a link farm. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and the benign-looking PDF links, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=pony+waifu+simulator+2.0
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ca6c945ce8ca462986d5ccd3d3f84bf6.pdf
    • https://static.usrfiles.com/ugd/77941b_806a482f88e2422fb90bbb305b259a78.pdf
    • https://static.usrfiles.com/ugd/cac9e4_8db2a7878e084df4aba499cdc7a8372c.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/990943287.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d549144de664d81b37a84ddd5084987.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f09115c31ba43d1998f27242f01d6c4.pdf
    • https://cdn.shopify.com/s/files/1/0439/6669/3534/files/antibiotics_resistance_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/soccer_juggling_trick.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/51674286824.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/gonenunilelefimapibusel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a13.bin
de85e29e803580e4a9f0bf9917de6b4d0fb211a95dd37216ec1eec6f3985b2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A13 5412 bytes
font_01_sfnt_off00005c71.bin
918a4847e08a82ced01af093e835ba547855fa5f6bd1f825d22ce8963497316b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C71 10364 bytes

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